Backport relocatability fixes

[traversaro]

As merging https://github.com/gazebosim/gz-sim/pull/1968 upstream is taking some time, let's backport the patch here. While this indeed introduces some new ABI symbols, if the symbols ends being changed in the upstream release, we can always re-introduce them with a custom patch, if that turns out to be necessary.

Similar to https://github.com/conda-forge/gz-physics-feedstock/pull/11 .

Checklist

• [x] Used a personal fork of the feedstock to propose changes
• [x] Bumped the build number (if the version is unchanged)
• [ ] Reset the build number to 0 (if the version changed)
• [x] Re-rendered with the latest conda-smithy (Use the phrase code>@<space/conda-forge-admin, please rerender in a comment in this PR for automated rerendering)
• [x] Ensured the license file is being packaged.

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[traversaro]

@conda-forge-admin, please rerender

[github-actions[bot]]

Hi! This is the friendly automated conda-forge-webservice.

I tried to rerender for you, but it looks like there was nothing to do.

This message was generated by GitHub actions workflow run https://github.com/conda-forge/gz-sim-feedstock/actions/runs/5321774113.

[traversaro]

Currently we also have the warning:

2023-06-20T11:32:05.3161857Z /home/conda/feedstock_root/build_artifacts/gz-sim7_1687259193132/work/src/systems/physics/Physics.cc:805:13: warning: 'GZ_PHYSICS_ENGINE_INSTALL_DIR' macro is deprecated, use gz::physics::getEngineInstallDir() function instead. 
2023-06-20T11:32:05.3162561Z   805 |   systemPaths.AddPluginPaths({GZ_PHYSICS_ENGINE_INSTALL_DIR});
2023-06-20T11:32:05.3163187Z       |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~  

We should add a local patch for that.

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